How to use ASF video converter to convert ASF on Mac?
What are. ASF files?
Advanced Systems Format (formerly Advanced Streaming Format, Active Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Windows Media framework.
The format does not specify how (i.e. with which codec) the video or audio should be encoded; it just specifies the structure of the video/audio stream. This is similar to the function performed by the QuickTime, AVI, or Ogg container formats. The most common filetypes contained within an ASF file are Windows Media Audio (WMA) and Windows Media Video (WMV).
How to play .ASF files on Mac OS X?
A solution is VLC. It plays a wide variety of video formats, including VCDs and DVDs.
Another solution is MPlayer, which plays a wide variety of formats. It's still under development and has some rough edges, so at this point VLC is a better choice.
How to use ASF video converter to convert ASF on Snow Leopard?
Software required:
iMedia Converter for Mac ( Convert DVD and Video to ASF or convert ASF files to pretty much any format)
Download URL: Inter Version
Note: This tutorial is on how to convert DVD and videos to ASF on Mac. You can also use this software to convert ASF to MOV, MP4, MPEG, etc. on Mac.
Run iMedia Converter for Mac
To install it, simply mount the .dmg archive by double-clicking it, and drag the application to your applications folder (or wherever you want it).
Load DVD or Videos you want to convert to ASF
Drag & drop the DVD disc image 
or video file(s) to the grey area. Or go to "File" menu, choose "Load DVD" or "Add Video/Audio files" and navigate to the files you want to add.
After a DVD or several video files are imported successfully, you can see all of them listed in the program.
Choose output format as ASF
Simply click the format icon 
to open output format list.Choose ASF format from the format drop-down list before the conversion.
Edit the DVD or video (Optional)
You can trim, crop, set special effect or add watermark to DVD and videos on Mac.
Convert Videos and DVD to ASF
Click "Convert" button to start to convert Videos and DVD to ASF.
You can also use iMedia Converter to extract audio from DVD and Videos.
Then you can transfer the output ASF videos to the movie folder via explorer or finder.
